制备高致密球形Ni_(1/3)Co_(1/3)Mn_(1/3)(OH)_2的影响因素分析与控制

Analysis and control of factors influencing synthesizing spherical Ni_(1/3)Co_(1/3)Mn_(1/3)(OH)_2 with higher density

球形Ni1/3Co1/3Mn1/3(OH)2是控制结晶-固相合成法制备球形LiNi1/3Co1/3Mn1/3O2的前驱体,Ni1/3Co1/3Mn1/3(OH)2的理化指标对LiNi1/3Co1/3Mn1/3O2综合性能具有深刻影响。为提高电池体积比容量,必须首先合成出高致密、晶型结构完整、颗粒形貌为球形的Ni1/3Co1/3Mn1/3(OH)2前驱体。采用络合共沉淀法制备出了高致密球形Ni1/3Co1/3Mn1/3(OH)2前驱体,研究了制备过程中反应温度、氨碱摩尔比、反应体系pH值、搅拌强度、反应周期等五大因素对高致密球形Ni1/3Co1/3Mn1/3(OH)2合成的影响机理。通过合理优化工艺,控制各项因素,制备出了球形、d50=8.5μm左右、振实密度≥2.3 g/cm3的高致密球形Ni1/3Co1/3Mn1/3(OH)2。

The spherical Ni1/3Co1/3Mn1/3（OH）2 is the precursor to prepare spherical Ni1/3Co1/3Mn1/3（OH）2 by controlling crystallization and solid state reaction. The physicochemical properties of the Ni1/3Co1/3Mn1/3（OH）2 have a profound effect on the performance of LiNi1/3Co1/3Mn1/3（OH）2. The precursor Ni1/3Co1/3Mn1/3（OH）2 with high density, line crystal structure and sphedcal morphology should be synthesized in order to improve the volumetric capacity of the battery. In this paper, the high density and spherical Ni1/3Co1/3Mn1/3（OH）2 precursor was synthesized by chemical co-precipitation, and the factors including reacting temperature, molar ratio of ammonia -alkali, pH value, stirring intensity and the reaction cycle that affected the synthesis of high density spherical Ni1/3Co1/3Mn1/3（OH）2 were studied. The high density and spherical Ni1/3Co1/3Mn1/3（OH）2 with d50=8.5 μm, and tap density ≥2.3 g/cm3 was synthesized by optimizing the process.